[Intel-gfx] How to convert drivers/gpu/drm/i915/ to use local workqueue?

[Tetsuo Handa]

Hello.

Like commit c4f135d643823a86 ("workqueue: Wrap flush_workqueue() using
a macro") explains, we are removing flush_scheduled_work() calls. And now

  drivers/gpu/drm/i915/display/intel_display.c
  drivers/gpu/drm/i915/gt/selftest_execlists.c

are the last flush_scheduled_work() callers which have no patch proposed.
I want to make a patch like
https://lkml.kernel.org/r/e9b95132-89cd-5cfc-1a09-966393c5ecb0@I-love.SAKURA.ne.jp
but I couldn't understand how to interpret drivers/gpu/drm/i915/ part.



There are many schedule_work()/schedule_delayed_work() callers within
drivers/gpu/drm/i915/ directory.

intel_modeset_driver_remove_noirq() in intel_display.c says

        /* flush any delayed tasks or pending work */
        flush_scheduled_work();

but intel_display.c itself does not call schedule_delayed_work().
Then, does this flush_scheduled_work() mean to wait all schedule_work()/schedule_delayed_work()
calls inside drivers/gpu/drm/i915/ directory?

wait_for_reset() in selftest_execlists.c says

	flush_scheduled_work();

but selftest_execlists.c itself does not call schedule_work()/schedule_delayed_work().
Then, does this flush_scheduled_work() mean to wait all schedule_work()/schedule_delayed_work()
calls inside drivers/gpu/drm/i915/ directory, by sharing a WQ created for
intel_modeset_driver_remove_noirq() ?